Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 72: Low-Dimensional Systems: Poster Session

TT 72.2: Poster

Mittwoch, 18. März 2015, 15:00–18:00, Poster B

Phases and phase transitions in a rotated Kitaev model — •Eoin Quinn, Roderich Moessner, and Subhro Bhattacharjee — Max-Planck-Institut für Physik komplexer Systeme, Dresden, Germany

We investigate a variant of Kitaev's honeycomb model which also realises an exactly solvable quantum spin liquid, and analyse an extended phase diagram that takes into account Heisenberg perturbations and a magnetic field. The system has essential differences from the original construction of Kitaev, with interesting consequences appearing already in the exact solution. In an appropriate limit, the model reduces to a toric code model on a Kagome lattice. The effect of the Heisenberg interactions are examined using a combination of analytical and numerical approaches, and in the toric code limit we find a continuous quantum phase transition between the quantum spin liquid and a magnetically ordered phase which belongs to the 3D-XYxZ2 universality class.